3 / 4 / 8 = L / 20 / h
L/20 = 3/4 so L= 15
20/h = 4/8 so h = 40
ends = 2 (20 * 40)
top and bottom = 2 ( 20 *15)
sides = 2 (15*40)
now add
The ratio of length to width to height of a rectangular prism is 3:4:8. If the prism is 20 feet wide, what is the surface area of the prism?
1 answer